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Dr. John Ball suggests that 50% of tree failures can't be predicted (at ISA). Don't know where these numbers can come from, honestly.

Shooting a line up high an bounce testing can probably help. Maximum load and leverage from the climbers weight. I have a friend who broke a red alder this way that he was going to climb.

Yes, large tops can push hard against a big lever, the spar. How do you suggest to minimize this?

How big a top? Locked up rope or was it let run? I did all my work from the ground today, essentially in a 15 sucker clump of bigleaf maple, from an old stump. One lead had peeled with no warning or wind according to the HO. I didn't trust it.

I concur with this experience. Cory, yes, I agree for max production with a very dialed crew, this is not ideal. For a less dialed-in crew, separating the hydraulic supply into two mutually exclusive circuits seems safer. I suppose you can put in a larger piece, as you don't need to get...

THIS!